<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			function add (a,b) {
				var sum = a + b
				return sum
			}
			var c = add(10,20)
			console.log(c)
		</script>
	</body>
</html>
